Carb leaking fuel and idle too high

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  • dbursell
    • Feb 2026
    #1

    Carb leaking fuel and idle too high

    Hi all

    I have a Suzuki GS450Ex 1981 with the Mikuni BS34 carbs. I have just cleaned them and got them on the bike and finally the bike starts and runs on its own fuel, not just the start gas like it did before. However the idle seems a little too high and I can't adjust it down no matter how much I adjust the idle screw. I guess the intake boots could be old? But I wonder as well, could it be that the air box needs to be replaced too? Does it matter that it seals correctly between the carb and air box or is it just important between the carb and the engine?

    Secondly the carb is leaking fuel from the T-line I suspect? Having a hard time finding a t-line that will fit the carbs and a company/seller that ships internationally (I'm in sweden). Any one got any good tips on where to look, preferably a link to an eBay item that they know fits. I can only find ones similar that are for the yamaha xs, will they fit, which models have the same carb?

    Thanks for any advice
    Tags: carb, gs450, idle, t-line
    • Guest
      #2
      Suzuki still makes the fuel-T. It is listed on Bike Bandit, so you should be able to order it from a dealer or online parts dealer. They wanted $36.00 for it, but it's a part that is necessary. The seal between the carbs and air box are very important. Too much air will cause a lean condition and you will never be able to adjust them properly. Get those problems sorted out and that may cure the idle problem.
      Last edited by Guest; 12-31-2016, 11:15 AM.

        Comment

        • Steve
          GS Whisperer
          • Jun 2005
          • 35925
          • southwest oHIo
          #3
          Make sure there is some slack in the throttle cable.

          Look where the cable attaches to the carbs. The inner cable should be loose when the throttle is closed.
          If it is tight, make an adjustment either at the top (next to the throttle grip) or at the bottom, where the cable attaches to the carbs.

          .
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            Comment

            • Nessism
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Mar 2006
              • 35790
              • Torrance, CA
              #4
              Rubber O-rings on the intake boots are likely to be leaking unless you replaced them.

              http://www.partzilla.com/parts/detai...685-44110.html
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

              Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

              Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

              KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                Comment

                • dbursell
                  #5
                  Thanks for the advice. I will replace the o-rings on the intake boots and give a closer look to the throttle cable. Hope that helps.

                    Comment

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